Return-path: Received: from nbd.name ([46.4.11.11]:51045 "EHLO nbd.name" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753678AbaD0Ohr (ORCPT ); Sun, 27 Apr 2014 10:37:47 -0400 From: Felix Fietkau To: linux-wireless@vger.kernel.org Cc: linville@tuxdriver.com Subject: [PATCH 3.15] ath9k_hw: do not lower ANI setting below default on AR913x Date: Sun, 27 Apr 2014 16:37:39 +0200 Message-Id: <1398609459-42175-1-git-send-email-nbd@openwrt.org> (sfid-20140427_163752_007281_3FDBD16A) Sender: linux-wireless-owner@vger.kernel.org List-ID: When the amount of noise fluctuates strongly, low immunity settings can sometimes disrupt signal detection on AR913x chips. When that happens, no OFDM/CCK errors are reported anymore, and ANI tunes the radio to the lowest immunity settings. Usually rx/tx fails as well in that case. To fix this, keep noise immunity settings at or above ANI default level, which will keep radio parameters at or above INI values. Signed-off-by: Felix Fietkau --- drivers/net/wireless/ath/ath9k/ani.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/net/wireless/ath/ath9k/ani.c b/drivers/net/wireless/ath/ath9k/ani.c index 6d47783..ba502a2 100644 --- a/drivers/net/wireless/ath/ath9k/ani.c +++ b/drivers/net/wireless/ath/ath9k/ani.c @@ -155,6 +155,9 @@ static void ath9k_hw_set_ofdm_nil(struct ath_hw *ah, u8 immunityLevel, ATH9K_ANI_RSSI_THR_LOW, ATH9K_ANI_RSSI_THR_HIGH); + if (AR_SREV_9100(ah) && immunityLevel < ATH9K_ANI_OFDM_DEF_LEVEL) + immunityLevel = ATH9K_ANI_OFDM_DEF_LEVEL; + if (!scan) aniState->ofdmNoiseImmunityLevel = immunityLevel; @@ -235,6 +238,9 @@ static void ath9k_hw_set_cck_nil(struct ath_hw *ah, u_int8_t immunityLevel, BEACON_RSSI(ah), ATH9K_ANI_RSSI_THR_LOW, ATH9K_ANI_RSSI_THR_HIGH); + if (AR_SREV_9100(ah) && immunityLevel < ATH9K_ANI_CCK_DEF_LEVEL) + immunityLevel = ATH9K_ANI_CCK_DEF_LEVEL; + if (ah->opmode == NL80211_IFTYPE_STATION && BEACON_RSSI(ah) <= ATH9K_ANI_RSSI_THR_LOW && immunityLevel > ATH9K_ANI_CCK_MAX_LEVEL_LOW_RSSI) -- 1.8.5.2 (Apple Git-48)